RewriteRule ^(.*)[.]html[.]pl$ http://%{SERVER_NAME}/$1.pm [R=301,L]
RewriteRule ^(.*?)/+Index[.]pm$ http://%{SERVER_NAME}/$1/ [R=301,L]
RewriteCond %{REQUEST_FILENAME}/Index.pm -f
RewriteRule ^(.*)[.]html[.]pl$ http://%{SERVER_NAME}/$1.pm [R=301,L]
RewriteRule ^(.*?)/+Index[.]pm$ http://%{SERVER_NAME}/$1/ [R=301,L]
RewriteCond %{REQUEST_FILENAME}/Index.pm -f